TypeError: possibleTypes[supertype].forEach is not a function

Question

这是我的代码。

import { ApolloClient, ApolloProvider, InMemoryCache } from "@apollo/client";
import { createHttpLink } from "apollo-link-http";
import { render } from "react-dom";
import React from "react";

import RouteCollector from "./routeCollector";

import "./index.css";
import possibleTypes from "./tools/graphqlCodeGenerator/possibleTypes.json";

const cache = new InMemoryCache({
  possibleTypes,
});

const link = createHttpLink({
  uri: "http://localhost:8000/graphql",
  credentials: "include",
});

const client = new ApolloClient({
  cache,
  link,
});

render(
  <ApolloProvider client={client}>
    <RouteCollector />
  </ApolloProvider>,
  document.getElementById("root")
);

我正在使用软件包 " @ apollo / client ":" ^ 3.0.2 "、"apollo-link-http": "^1.5.17", "graphql": "^15.3.0"、"react": "^16.13.1",

当我运行程序出现错误时

TypeError: possibleTypes[supertype].forEach is not a function

如何修复错误？

Answer 1

如果您使用的是 GraphQL 代码生成器，则应确保您使用的是 fragment-matcher 插件生成的对象的 possibleTypes 属性，如下所示：

import introspectionResult from '../introspection-result';

const cache = new InMemoryCache({
  possibleTypes: introspectionResult.possibleTypes,
});

您不能传递生成的整个对象。

您还需要确保在代码生成配置中将 apolloClientVersion 设置为 3，以确保生成正确的对象。

TypeError: possibleTypes[supertype].forEach is not a function

TypeError: possibleTypes[supertype].forEach is not a function

apollo

reactjs

graphql

apollo-client